You took an electroscope. You initially charged it with net negative charge. Now you want to determine the unknown charge of a charged rod. So you bring the charged rod very close to the electroscope, as a result, the separation between the gold leaves inside the electroscope increases. From this observation, you conclude that the unknown charged rod is: g

coil wire, increase current, put iron inside the coil

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.